Keyboard



FIG. 1 is a top front perspective view of a keyboard in accordance with the present design;

FIG. 2 is a top rear perspective view thereof.

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a left side view thereof.

Broken lines shown in the drawings illustrate portions of the keyboard, and form no part of the claimed design. 

CLAIM We claim the ornamental design for a keyboard, as shown and described. 